Final answer:
The Rule of 70 and growth rate (r) are used to calculate doubling time of population growth.
Explanation:
The Rule of 70 and growth rate (r) are used to calculate doubling time of population growth.
Doubling time (t) formula: t = 0.69 ÷ r. The Rule of 70 simplifies this calculation by stating that the doubling time is approximately 70 divided by the percentage growth rate.
Example: A 2% growth rate would have a doubling time of 35 years using the Rule of 70.
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